850
FNUS75 KBYZ 181308
FWSBYZ
SPOT FORECAST FOR BMW PILES...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
608 AM MST THU DEC 18 2025
FORECAST IS BASED ON IGNITION TIME OF 0700 MST ON DECEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
COOLER CONDITIONS WITH LIGHT SOUTHWEST WINDS CAN BE EXPECTED AT
THE BURN SITE TODAY. WINDS BEGIN INCREASING OUT OF THE SOUTHWEST
LATE THIS AFTERNOON AHEAD OF AN APPROACHING DISTURBANCE. GUSTY
WINDS WILL PREVAIL OVERNIGHT WITH INCREASING CHANCES FOR
RAIN/SNOW. A DISTURBANCE AND ASSOCIATED COLD FRONT WILL DROP
THROUGH THE AREA ON FRIDAY BRINGING FALLING TEMPERATURES, SNOW
CHANCES, AND DECREASING WINDS. SNOW WILL COME TO AN END FRIDAY
EVENING. CURRENT FORECAST IS FOR 2 TO 5 INCHES OF SNOW.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW IN THE AFTERNOON.
CWR.................15 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....32-37.
MIN HUMIDITY........40-44 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 10 MPH WITH GUSTS TO 20
MPH IN THE MORNING, INCREASING TO 10 TO 15 MPH
WITH GUSTS TO 30 MPH IN THE AFTERNOON.
RIDGETOP...........WEST TO SOUTHWEST 15 TO 30 MPH.
MIXING HEIGHT.......INCREASING TO 2100 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 20 TO 30 MPH.
TIME (MST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........63 60 65 81 89 85 86 87 87 86 86
WEATHER COV..... CHC CHC CHC CHC CHC CHC
WEATHER TYPE.... SN SN SN SN SN SN
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0
TEMP............18 19 21 23 25 26 27 29 30 30 33
RH..............59 60 50 45 42 53 52 56 55 58 57
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW S S
20 FT WIND SPD..7 7 8 10 11 11 11 12 13 13 14
20 FT WIND GUST.13 14 18 20 20 20 20 20 25 25 30
TONIGHT
SKY/WEATHER.........CLOUDY. CHANCE OF SNOW IN THE EVENING WITH
A CHANCE OF RAIN AND SNOW OVERNIGHT.
CWR.................20 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....30-34.
MAX HUMIDITY........65-72 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 10 TO 20 MPH WITH GUSTS TO
AROUND 30 MPH IN THE EVENING, INCREASING
TO 15 TO 25 MPH WITH GUSTS TO 40 MPH OVERNIGHT.
RIDGETOP...........SOUTHWEST 25 TO 40 MPH.
MIXING HEIGHT.......DECREASING TO 600 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST 30 TO 40 MPH.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........91 94 95 94 95 94 95 83 87 93 91 81
WEATHER COV.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC LKY
WEATHER TYPE....SN SN SN SN SN SN SN SN RS RS RS SN
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............33 35 33 35 35 35 37 38 38 41 40 40
RH..............61 63 65 68 68 68 68 66 66 61 63 60
20 FT WIND DIR..S S S S SW SW SW SW SW SW SW SW
20 FT WIND SPD..15 17 17 16 15 14 14 16 17 18 20 20
20 FT WIND GUST.30 30 30 30 30 30 30 35 35 35 36 36
FRIDAY
SKY/WEATHER.........MOSTLY CLOUDY. SNOW LIKELY.
CWR.................85 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....35-40.
MIN HUMIDITY........58-62 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 15 TO 25 MPH WITH GUSTS TO 40
MPH IN THE MORNING DECREASING TO WEST 10 TO 20 MPH
WITH GUSTS TO 30 MPH IN THE AFTERNOON.
RIDGETOP...........SOUTHWEST 25 TO 40 MPH BECOMING WEST
AROUND 15 TO 30 MPH IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 3500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 40 MPH DECREASING TO 30 MPH
IN THE AFTERNOON.
TIME (MST) 6 AM 9 AM NOON 3 PM
SKY (%).........76 76 94 94
WEATHER COV.....LIKELY LIKELY DEFNTE DEFNTE
WEATHER TYPE....SNOW SNOW SNOW SNOW
TSTM COV........
CHC OF LTNG (%).0 0 0 0
TEMP............39 40 40 32
RH..............63 60 63 70
20 FT WIND......SW 20G40 SW 18G35 W 16G25 W 17G30
FORECASTER...PALMQUIST
REQUESTED BY...JAMES PUMMEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2527766.2/BYZ
.DELDT 12/18/25
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.PUMMEL@USDA.GOV,ANDRE.RAY@USDA.GOV,TYLER.KUHN@USDA.GOV
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